Move lint ci to github

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   ci:
     name: CI
-    needs: [test, test-release]
+    needs: [test, test-release, lint]
     runs-on: ubuntu-latest
     steps:
       - name: Done
@@ -65,6 +65,7 @@ jobs:
       - name: Install rust
         uses: actions-rs/toolchain@v1
         with:
+          profile: minimal
           toolchain: ${{ matrix.rust }}
           target: ${{ matrix.target }}
           override: true
@@ -138,3 +139,48 @@ jobs:
       - name: Cleanup cache
         if: steps.cache.outputs.cache-hit != 'true'
         run: cargo cache -a
+  lint:
+    name: Linting (fmt + clippy)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Ready cache
+        run: sudo chown -R $(whoami):$(id -ng) ~/.cargo/
+      - name: Cache cargo
+        uses: actions/cache@v1
+        id: cache
+        with:
+          path: ~/.cargo
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+      - name: Clippy for almost no features
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --no-default-features --features "std cargo" -p clap:3.0.0-beta.2
+      - name: Clippy for all features
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --features "yaml unstable" -- -D warnings
+      - name: Format check
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: -- --check
+      - name: Install cargo-cache
+        uses: actions-rs/install@v0.1
+        if: steps.cache.outputs.cache-hit != 'true'
+        with:
+          crate: cargo-cache
+          use-tool-cache: true
+      - name: Cleanup cache
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: cargo cache -a

.travis.yml

@@ -35,15 +35,6 @@ jobs:
       script:
         - cargo test --no-default-features --features "std cargo" -p clap:3.0.0-beta.2
         - cargo test --features "yaml unstable doc"
-    - name: Linting (fmt + clippy)
-      before_script:
-        - rustup component add clippy
-        - rustup component add rustfmt
-      script:
-        - echo "Checking codebase with Clippy release `cargo clippy --version`."
-        - cargo clippy --lib --features "yaml unstable" -- -D warnings
-        - cargo clippy --tests --examples --features "yaml unstable" -- -D warnings
-        - cargo fmt -- --check
     - name: Coverage
       addons:
         apt: